1. Adtran Inc
2. Alcatel-Lucent Enterprise
3. Arista Networks Inc
4. Ciena Corporation
5. Cisco Systems Inc
6. Fujitsu Optical Components Limited
7. Huawei Technologies Co Ltd
8. Infinera Corporation
9. Juniper Networks Inc
10. Mitsubishi Electric Corporation
11. Nec Corporation
12. Nokia Corporation
13. Ribbon Communications Inc
14. Telefonaktiebolaget Lm Ericsson
15. Zte Corporation